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/**********************************************************************
object_traceing.c - Object Tracing mechanism/ObjectSpace extender for MRI.
$Author$
created at: Mon May 27 16:27:44 2013
NOTE: This extension library is not expected to exist except C Ruby.
NOTE: This feature is an example usage of internal event tracing APIs.
All the files in this distribution are covered under the Ruby's
license (see the file COPYING).
**********************************************************************/
#include "ruby/ruby.h"
#include "ruby/debug.h"
size_t rb_gc_count(void); /* from gc.c */
struct traceobj_arg {
VALUE newobj_trace;
VALUE freeobj_trace;
st_table *object_table;
st_table *path_table;
struct traceobj_arg *prev_traceobj_arg;
};
struct traceobj_arg *traceobj_arg; /* TODO: do not use GLOBAL VARIABLE!!! */
struct allocation_info {
char *path;
unsigned long line;
size_t generation;
};
static void
newobj_i(VALUE tpval, void *data)
{
struct traceobj_arg *arg = (struct traceobj_arg *)data;
rb_trace_arg_t *tparg = rb_tracearg_from_tracepoint(tpval);
VALUE obj = rb_tracearg_object(tparg);
VALUE path = rb_tracearg_path(tparg);
VALUE line = rb_tracearg_lineno(tparg);
long path_len = RSTRING_LEN(path);
struct allocation_info *info = (struct allocation_info *)ruby_xmalloc(sizeof(struct allocation_info));
char *path_cstr = ruby_xmalloc(path_len + 1);
char *path_stored_cstr;
strncpy(path_cstr, RSTRING_PTR(path), path_len);
path_cstr[path_len] = 0;
if (st_get_key(arg->path_table, (st_data_t)path_cstr, (st_data_t *)&path_stored_cstr)) {
st_data_t n;
st_lookup(arg->path_table, (st_data_t)path_stored_cstr, &n);
st_insert(arg->path_table, (st_data_t)path_stored_cstr, n+1);
ruby_xfree(path_cstr);
path_cstr = path_stored_cstr;
}
else {
st_add_direct(arg->path_table, (st_data_t)path_cstr, 1);
}
info->path = path_cstr;
info->line = NUM2INT(line);
info->generation = rb_gc_count();
st_insert(arg->path_table, (st_data_t)path_cstr, 0);
st_insert(arg->object_table, (st_data_t)obj, (st_data_t)info);
}
static void
freeobj_i(VALUE tpval, void *data)
{
struct traceobj_arg *arg = (struct traceobj_arg *)data;
rb_trace_arg_t *tparg = rb_tracearg_from_tracepoint(tpval);
VALUE obj = rb_tracearg_object(tparg);
struct allocation_info *info;
st_data_t n;
if (st_delete(arg->object_table, (st_data_t *)&obj, (st_data_t *)&info)) {
st_lookup(arg->path_table, (st_data_t)info->path, &n);
if (n == 1) {
st_delete(arg->path_table, (st_data_t *)&info->path, 0);
ruby_xfree(info->path);
}
else {
st_insert(arg->path_table, (st_data_t)info->path, n-1);
}
ruby_xfree(info);
}
}
static int
free_keys_i(st_data_t key, st_data_t value, void *data)
{
ruby_xfree((void *)key);
return ST_CONTINUE;
}
static int
free_values_i(st_data_t key, st_data_t value, void *data)
{
ruby_xfree((void *)value);
return ST_CONTINUE;
}
static VALUE
stop_trace_object_allocations(void *data)
{
struct traceobj_arg *arg = (struct traceobj_arg *)data;
rb_tracepoint_disable(arg->newobj_trace);
rb_tracepoint_disable(arg->freeobj_trace);
st_foreach(arg->object_table, free_values_i, 0);
st_foreach(arg->path_table, free_keys_i, 0);
st_free_table(arg->object_table);
st_free_table(arg->path_table);
traceobj_arg = arg->prev_traceobj_arg;
return Qnil;
}
static VALUE
trace_object_allocations(VALUE objspace)
{
struct traceobj_arg arg;
arg.newobj_trace = rb_tracepoint_new(0, RUBY_INTERNAL_EVENT_NEWOBJ, newobj_i, &arg);
arg.freeobj_trace = rb_tracepoint_new(0, RUBY_INTERNAL_EVENT_FREEOBJ, freeobj_i, &arg);
arg.object_table = st_init_numtable();
arg.path_table = st_init_strtable();
arg.prev_traceobj_arg = traceobj_arg;
traceobj_arg = &arg;
rb_tracepoint_enable(arg.newobj_trace);
rb_tracepoint_enable(arg.freeobj_trace);
return rb_ensure(rb_yield, Qnil, stop_trace_object_allocations, (VALUE)&arg);
}
struct allocation_info *
allocation_info(VALUE obj)
{
if (traceobj_arg) {
struct allocation_info *info;
if (st_lookup(traceobj_arg->object_table, obj, (st_data_t *)&info)) {
return info;
}
}
return NULL;
}
static VALUE
allocation_sourcefile(VALUE objspace, VALUE obj)
{
struct allocation_info *info = allocation_info(obj);
if (info) {
return rb_str_new2(info->path);
}
else {
return Qnil;
}
}
static VALUE
allocation_sourceline(VALUE objspace, VALUE obj)
{
struct allocation_info *info = allocation_info(obj);
if (info) {
return INT2FIX(info->line);
}
else {
return Qnil;
}
}
static VALUE
allocation_generation(VALUE objspace, VALUE obj)
{
struct allocation_info *info = allocation_info(obj);
if (info) {
return SIZET2NUM(info->generation);
}
else {
return Qnil;
}
}
void
Init_object_tracing(VALUE rb_mObjSpace)
{
rb_define_module_function(rb_mObjSpace, "trace_object_allocations", trace_object_allocations, 0);
rb_define_module_function(rb_mObjSpace, "allocation_sourcefile", allocation_sourcefile, 1);
rb_define_module_function(rb_mObjSpace, "allocation_sourceline", allocation_sourceline, 1);
rb_define_module_function(rb_mObjSpace, "allocation_generation", allocation_generation, 1);
}
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